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Finding the Fourth Proportional to 9.96, 14.88 and 8.40

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Solution

The fourth proportional to 9.96, 14.88 and 8.40 is: 12.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    9.96 : 14.88 = 8.40 : x
  2. Step 2: Convert to fraction form
    9.96/14.88 = 8.40/x
  3. Step 3: Cross multiply
    9.96x = 14.88 × 8.40
  4. Step 4: Simplify right side
    9.96x = 124.99
  5. Step 5: Solve for x
    x = 124.99/9.96
  6. Step 6: Final answer
    x = 12.55

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.